Headblock for sawmill carriages



C. W. WILLETTE. HEADBLOCK FOR SAWMILL CARFHAGES. APPLICATION FILED MAYZ, 1921.

1,404,820. Patented Jan. 31, 1922.

HTTORNEY ie i orrARLEs wKwILLn'rrE, or SE TTLE, WASHINGTON.

HEADIBLOCK FOR, SAWMILL CARRIAGES.

Specification of Letters Patent.

Patented Jan. 31, 1922.

Application filed May 2, 1921. Serial No. 466,082.

ing is a specification.

This invention relates to saw mill carriage head blocks; and its object is to improve the construction and efficiency of the same.

Theinvention consists in a head block having removable bar and wearing-plate members and to the means for reversibly mounting and securing the same in prede termined positions to the head block body member.

The invention further consists in the novel structural features and the combinations thereof as will be hereinafter described and claimed. V

In the accompanying drawings, illustrating the invention inthe form now preferred by me,

Figure ing my invention. Fig.2 is afragmentary front elevation. of the same. Fig. 3 is a perspective view of a head block bar member equipped with a wearing-plate. Fig. 1 is a detail section through k -410i Fig. 1.

The numeral 5 represents a saw-carriage having sup orting wheels 6 which travel on track-rails laid upon a mill floor. v

The carriage is provided withtransversely arranged head blocks such as B upon wh1ch is a knee 9 movable transversely of the carria e by means of suitable set works.

s illustrated in Figs. 1, 2 and 1, a head block comprises a hollow casting or body 8 which at opposite sides of its longitudinal axis is surmounted by removable bar members 10 which serve at 11 as guides for the knee 9.

A bar member is provided in its under side with a dovetail groove 12 to receive the correspondingly shaped upper portion 8 of a block body. In the top of a bar member 10 is also provided a dovetail groove 12 to receive a wearing-plate or rail 13 having cross section corresponding to the groove and of a thickness to protrude above the upper surface of the bar member.

is a transverse sectional view of r a saw carriage having a head block emhodyvanced.

The associated bar 10 and rail member 13 are secured against longitudinal d1splacements to a head block by means of bolts 14c,

14: and 14 extending through holes provided in the head block and represented by broken lines 15, 15 and l5 -in Fig. 1, to receive nuts 16 below the head block.

The foremost holes 15, oii e at each side of the block, are located in proximity to the front end of the same, and the central holes 15 are located midway between the forward and rear holes .15 and 15 Each of the bars is provided with holes 25 in proximity of its, ends 17 and intermediately thereof with holes 26 which latter are spaced to register with the body holes 15 and 15 when either of the holes 25 are in register with the hole-15 in either of the reversed positions of thebar in the respec tive groove 12.

As best shown in Fig. 3 a rail 13 is pro vided with two holes 18, 18 adjacent toits forward end 19; two holes 20, 20 adjacent to itsrear end; and two groups of holes 21, c

21 21 and 22, 22 22 disposed intermediate the pairs of holes aforesaid.

The holes 18, 21 and 22, moreover, are

located to register with the respective bar holes andthe block holes 15, 15 and 15 whenthe rail end 19 is approximately flush with the outer end as 17 of the bar.

, The holes 18 21 and 22' also are arranged to'register with the bar and block holes when, a rail has been suitably ad- The holes 20, 22 like manner are respectively disposed to register with. thezbar holes and block holes 15, 15. and 15 when a rail is in a position reversed to that in which it is illustrated in Fig. 1 and in one or the other of two predetermined positions longitudinally of the block.

As represented in Fig. 1 the plates or rails 13 are secured by the bolts 14, 1 1 and 1 1 engaging in the rail holes 18, 21 and 22.

When the outer ends of said rails become unduly worn, said bolts are withdrawn and, after shifting the rails forwardly, are inserted inthe rail holes 18 21 and 22 and thus secured by the respective nuts 16. With the plates thus arranged, or while removed, they are sawed or otherwise out 03 to cause the forward ends of the rails to be even 21 and 20 22 ,231 in V with the extremities of the adjacent bar ends 20, 22 21 and 20 22 21, as will be understood. v i I hen worn by the knees the bars 10 are reversed to present new wearing surfaces.

Inasmuch as the bars 10 and plates or rails 13 afford in their different positions renewed bearing surfaces, the cost of maintaining the wearing or log-bearing surfaces of a head block is reduced to a minimum and obviates the practice of frequently re moving head blocks to a machine shop for replamng the same. Y

The construction, operation and advantages of the invention will. be understood from the foregoing description. What I claim, is,

1. The combination with a head block having removable knee bearing guide bars thereon, said bars having grooves in the topsthereof and provided with a plurality of spaced holes, of a wearing-plate engaging ineach of said grooves, said plates being provided with series of holes-arranged to register with the aforesaid holes in different positions of the plates in said grooves, and bolts engageable in said holes'to secure the plates in adjustable positions to the head blocln 2. The combination with a head block having removable knee supporting members provided with longitudinally disposed dovetail shaped grooves therein and a series of spaced holes extending downwardly from each of said grooves to the underside of the 7 head block, of a wearing-plate of a dovetail shape in transverse section to fit within each of said grooves, said wearing-plates being each provided with series of holes which are adapted to register with the head block holes in difierent positions of the wearingplates, and bolts engaging in the holes of the head block and a'selected series ofthe plate holes for securing the plate in various predetermined positions longitudinally of the head block. p The combination with a head block having a knee bearingupper portion with a dovetail shaped groove in the top thereof,

- of a wearing-plateadapted to fit within said of bolts extending through said body for detachably securing said bars to the body, and bearing plates provided in the respective bar grooves, said bearing plates being provided with series of holes which are arranged to receive said bolts for securing the plates in different longitudinal and reversible positions with respectto said bars and the body.

6. A head block, a body member having dovetail shaped upper portions, said body being provided with series oif holes, kneeguiding and supporting bars provided'with dovetail slots engageable with the respective upper portions of the body, each'of said bars being provided with a series offholes which are arranged tohave some of them register with the holes of the body in reversed positions of the bars with respect tothe body, and bolts extending through holes of both the body and the bars for securing the latter to the body; I

Signed at Seattle, Washington, this 21st dayo f April 1921." I

i CHARLES W,

Witnesses Pram BARNES, MARGARET G. SUPPLE.

WILLETT 

